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  1. The origin of life on Earth, explained - University of Chicago News

  2. History of life - Wikipedia

  3. How did life on Earth begin? Here are 3 popular theories.

  4. Evolution and the history of life on Earth - Encyclopedia Britannica

  5. The Origin of Life on Earth - Scientific American

  6. Beginnings: Life on Our World and Others - NASA Science

  7. Timeline of the evolution of life on Earth - New Scientist

  8. Early Life on Earth – Animal Origins - History of Life on Earth

  9. How Did Life Begin? - Nature

  10. Life | Definition, Origin, Evolution, Diversity, & Facts | Britannica